A. 管道线路工程勘探点间距视地质条件复杂程度而定，宜为200～1000m
B. 勘探孔深度宜为管道埋设深度以下1～3m
C. 对管道穿越工程，勘探点宣布置在穿越管道的中线上；偏离中线最大不应大于3m
D. 对管道穿越工程，勘探点间距最大不应大于200m，最少不应少于3个
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